The standard deviation is a measure of how spread out your data are. It is useful in comparing sets of data which may have the same mean but a different range. Computation of the standard deviation is a bit tedious. The steps are:
Compute the mean for the data set.
Compute the deviation by subtracting the mean from each value.
Square each individual deviation.
Add up the squared deviations.
Divide by one less than the sample size.
Take the square root
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